Helppp

Had unprotected sex many times this month (stupid I know) and I’m not supposed to get my period for another week. I have always been super regular. I don’t think I’ve really ever had a period that wasn’t regular for me. I haven’t had many symptoms of PMS, usually I can tell I’m about to get my period by my discharge. And I went to the bathroom and saw blood. However the blood looked weird like something I haven’t seen before. And it’s really light. Could it be implantation bleeding?